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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Upgrade to 8.5.8/9
Date Tue, 20 Dec 2016 14:10:43 GMT
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Greg,

On 12/20/16 3:21 AM, Greg Huber wrote:
>> If you are using httpd + mod_jk, why are you bothering with APR
>> and tcnative on the Tomcat side?
> 
> It complains in the log file so I do what it says.  If I don't need
> it it saves me having to compile it all the time.

You get complaints about the APR library not being installed? Yeah,
just comment-out the APRLifecycleListener in conf/server.xml.

>> What if you use the NIO connector instead of APR?
> 
> Have always run tomcat with apache and mod_jk has always worked. I
> could look at NIO if all else fails.

No matter what kind of protocol you use (HTTP, AJP13), you can still
choose the I/O strategy (APR, NIO, NIO2). The pure-Java blocking I/O
connector (BIO) was removed in 8.5.x and 9.0.x, so that's no longer an
option.

>> Can you post your <Connector> configuration?
> 
> I do not modify anything here.
> 
> My setup:
> 
> workers.properties:
> 
> worker.list=worker1 worker.worker1.type=ajp13 
> worker.worker1.host=localhost worker.worker1.port=8009 
> worker.worker1.lbfactor=50 worker.worker1.socket_keepalive=1
> 
> tomcat.conf
> 
> ... JkWorkersFile "/etc/httpd/conf.d/workers.properties" # Set the
> log file JkLogFile "/etc/httpd/logs/mod_jk.log" JkShmFile
> "/etc/httpd/logs/jk-runtime-status.log" JkLogLevel info 
> JkLogStampFormat "[%a %b %d %H:%M:%S %Y]" .... <VirtualHost *:80> 
> ... JkMount  / worker1 JkMount  /* worker1 </VirtualHost>

That looks okay to me, though it doesn't look like you actually need
httpd in the mix, here. I'll just assume that you are fronting Tomcat
for a good reason and not "because that's how it's supposed to be done."

> setenv.sh :
> 
> export CATALINA_OPTS="$CATALINA_OPTS -Xms256m" export
> CATALINA_OPTS="$CATALINA_OPTS -Xmx768m"

Off-topic hint: if you are going to give your JVM 768M, you may as
well do it all at once and set -Xms == -Xmx.

> export CATALINA_OPTS="$CATALINA_OPTS -Xss256k"
> 
> export CATALINA_OPTS="$CATALINA_OPTS -XX:+UseParallelGC"
> 
> export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxGCPauseMillis=1500"
> 
> export CATALINA_OPTS="$CATALINA_OPTS -XX:GCTimeRatio=9"
> 
> export CATALINA_OPTS="$CATALINA_OPTS -server"
> 
> export CATALINA_OPTS="$CATALINA_OPTS -XX:+DisableExplicitGC"
> 
> 
> Not sure where these exports came from but they seem to work up to
> 8.5.x

They control the JVM, not Tomcat. If you are administering this Tomcat
instance, I urge you to learn more about what they do. Mysteries don't
help administrators do their jobs.

> The last start/stop catalina.out :
> 
> 17-Dec-2016 15:21:51.022 INFO [main] 
> org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded
> APR based Apache Tomcat Native library 1.2.10 using APR version
> 1.5.2. 17-Dec-2016 15:21:51.022 INFO [main] 
> org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR 
> capabilities: IPv6 [true], sendfile [true], accept filters [false],
> random [true]. 17-Dec-2016 15:21:51.023 INFO [main] 
> org.apache.catalina.core.AprLifecycleListener.lifecycleEvent
> APR/OpenSSL configuration: useAprConnector [false], useOpenSSL
> [true] 17-Dec-2016 15:21:51.036 INFO [main] 
> org.apache.catalina.core.AprLifecycleListener.initializeSSL
> OpenSSL successfully initialized (OpenSSL 1.0.2j  26 Sep 2016) 
> 17-Dec-2016 15:21:52.967 INFO [main] 
> org.apache.coyote.AbstractProtocol.init Initializing
> ProtocolHandler ["http-nio-8080"] 17-Dec-2016 15:21:53.124 INFO
> [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector
> Using a shared selector for servlet write/read 17-Dec-2016
> 15:21:53.160 INFO [main] org.apache.coyote.AbstractProtocol.init
> Initializing ProtocolHandler ["ajp-nio-8009"]

So, you've got an HTTP connector on port 8080 and an AJP connector on
port 8009. You aren't using TLS at all, so you can definitely let the
APR LifecycleListener go and stop re-compiling libtcnative for each
release. It looks like you also aren't using your connector on port
8080, so you can disable that, too. You likely have JVM threads that
are sitting idle all the time.

Oh, and you're already using NIO. :)

> 17-Dec-2016 15:23:08.320 INFO [main] 
> org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler 
> [http-nio-8080] 17-Dec-2016 15:23:08.341 INFO [main] 
> org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler 
> [ajp-nio-8009]

Looks like these guys started-up okay.

> 17-Dec-2016 15:23:08.342 INFO [main] 
> org.apache.catalina.startup.Catalina.start Server startup in 75173
> ms

Okay.

> 17-Dec-2016 15:59:45.589 INFO [Thread-7] 
> org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler 
> ["http-nio-8080"] 17-Dec-2016 15:59:45.805 INFO [Thread-7] 
> org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler 
> ["ajp-nio-8009"]

A few minutes later, you stop the server.

I don't see any problems, here, except that you are saying you are
getting connection failures.

After Tomcat is started, can you run this command on the server
running both httpd and Tomcat?

$ sudo netstat -plan | grep 8009

- -chris
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